import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../views/Login.vue'

Vue.use(VueRouter)

const routes = [
  {
    path:'/',redirect:'/login'
  },
  {
    path: '/login',
    name: 'Login',
    component: Login
  },
  {
    path: '/home',
    name: 'Home',
    // route level code-splitting
    // this generates a separate chunk (about.[hash].js) for this route
    // which is lazy-loaded when the route is visited.
    component: () => import(/* webpackChunkName: "about" */ '../views/Home.vue')
  }
]

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

//挂载路由导航守卫
router.beforeEach((to,from,next)=>{
  //to将要访问的路径
  //from 代表从那个路径跳转而来
  //next 是一个函数，表示放行
  //next() 放行  next('/login') 强制跳转
  
  if(to.path==='/login') return next()
  //获取token
  const tokenStr=window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})

export default router
